﻿    <p>
      An <em>IfcMetric</em> is used to capture quantitative
      resultant metrics that can be applied to objectives.
    </p>
    <p>
      <em>IfcMetric</em> is a subtype of <em>IfcConstraint</em> and
      may be associated with any subtype of <em>IfcRoot</em>
      through the <em>IfcRelAssociatesConstraint</em> relationship
      in the <em>IfcControlExtension</em> schema, or may be
      associated with <em>IfcProperty</em> by
      <em>IfcResourceConstraintRelationship</em>.
    </p>
    <p>
      The aim of <em>IfcMetric</em> is to capture the quantitative
      aspects of a constraint.
    </p>

    <blockquote class="history">
      HISTORY&nbsp; New entity in IFC2.0.
    </blockquote>
    <blockquote class="change-ifc2x4">
      IFC4 CHANGE&nbsp; ReferencePath attribute added for indicating the value to be constrained along a path of attribute references.
    </bloclquote>
